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CPU dead?

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September 20, 2007 12:08:38 PM

So thinking I am a pro and all I go off and buy all new components for my first big build. This is PSU, proc, graphics card, ram, case, etc.

The first problem I encounter is that my PSU did not come with a 4P plug for the power port near the CPU. So I look through the manual and I notice that what it does have is an 8P plug that has the same voltage and grounds that corrospond with the pins. Heres where I screwed up... Instead of pluggin the 8 pin wire in I accidently plugged the PCI-E 6 pin plug in, which gives 12V where its supposed to be G and Ground where its supposed to be 12V.

So when nothing happened when I hit power I was confused and retraced my steps. I realized the problem and took the PCI-E wire out and plugged the 8 pin in. Then when I hit power all of the fans powered on but I got no display and a long 2-3 sec system beep that went on continuesly. I've tried a different PSU that had the correct 4P connector for my mobo and same results so I think the 8pin is fine aswell as my PSU. I also reseated ram, and flashed my bios. the ram is new I've tried with just 1 stick and still same results. Since all of the fans opperate on the Mobo i'm left to assume that the mobo is fine.

My only guess is that I fried my CPU with the huge mistake I made above, but before I go buy a new one to test swapping it out I wanted to check in with the pro's here to see if any of you can affirm that my mistake that I made would in fact fry the CPU.

I'm very open to any other tests and suggestions aswell.

Thanks

More about : cpu dead

September 20, 2007 12:37:13 PM

Here is a list of my components
GIGABYTE GV-NX88S320H-B-RH GeForce 8800GTS 320MB
GIGABYTE GA-M61P-S3 AM2 NVIDIA GeForce 6100 ATX AMD Motherboard
AMD Athlon 64 X2 6000+ Windsor 3.0GHz Socket AM2 Processor Model ADX6000CZBOX - Retail
SILVERSTONE ST50EF-SC ATX12V / EPS12V 500W Power Supply
Corsair TWIN2X2048-6400C4 2GB Kit DDR2-800

the bios is Award Energy Star.
September 20, 2007 12:59:03 PM

Since the ground pin on the motherboard connector is actually grounded it would have simply shorted the power supply 12v to ground, and having nothing on the 12v input is obviously harmless, so I strongly doubt any damage was done to the CPU. And if you tried another PSU without results then the native PSU is probably ok also. It's VAGUELY possible that a trace on the MB is burned.

Before panicking I would look for some other reason for the failure to boot unrelated to the connection mistake. For instance is the video card getting power?
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September 20, 2007 1:41:34 PM

I'm using the onboard video at the moment. Thanks for the info, I was just about ready to send the CPU back, but it sounds like it may be more of a mobo issue then CPU related.

Would the torque of the mobo mounting screws cause any issues. I didn't put a lot of strength into tightening them as I didn't want to cause any damage.
a c 172 à CPUs
September 20, 2007 1:49:08 PM

I think your CPU is OK. I am pretty sure that you need a working CPU to produce any beeps. Because the PMW regulator on the motherboard that feeds the CPU runs off 12 volts from the 4/8 pin PSU cable, I also think the 12 volt PSU output is good.

Although your computer is not completely dead, it is a new build. The following is pasted from a savefile. It's a lot of work, but the troubleshooting suggestions may help you isolate the bad components.

From the savefile:

I see quite a few "new build failure" threads here. The following is one of my replies that I have cleaned up, expanded, and saved. This assumes that the new build is completely dead. Even if not, the same principles still apply.
_________________________________________________________________________________________

Assuming the speaker is properly connected to the motherboard, no beep means the POST did not run. A bad video card or bad memory would still generate a beep pattern indicating video or memory problems.

(You should become familiar with the POST codes. Your motherboard manual may list them. If not,
google something like "<motherboard brand> or <BIOS brand> post codes".)

Turn off the computer with the switch on the back of the PSU or unplug it. Wait a few minutes. While you are waiting, double check all the cable connections. Make sure that the case switches and LED's are connected correctly. Pay close attention to the main power connector to the motherboard. If the computer is completely dead (doesn't start), the case power switch may be bad. Swap it with the reset switch. Turn on the computer. If it still doesn't work, you have to resort to serious trouble-shooting.

If so, six possibilities:

1. The motherboard is improperly installed in the case, shorting something out. This happens surprisingly often.

2. Bad or inadequate PSU. A working PSU will send a control signal call "PSGood" to the motherboard. The motherboard needs this signal before the CPU can start the boot process. A problem with any output should kill the PSGood signal. PC's with modern components NEED a good PSU. The forums here contain guides on how to select (by brand and capacity) a good PSU. And even a reputable PSU may be DOA.

3. A bad drive or video card affecting the PSU.

4. Bad memory.

5. Bad CPU.

6. Bad motherboard.

CAUTION - you need to turn off the computer each time you install or remove anything. I know this sounds stupid, but you'd be surprised ...

Disassemble everything. Breadboard (assemble the components outside the case on an insulated surface) only the PSU, motherboard and speaker, and CPU and HSF. If the problem was in the CPU socketing, reinstalling the CPU should solve it. Now you need a way to turn on the computer. I use wiring, switches, and LED's scavenged from an old case.

Turn on the computer. If the fans start spinning, you have a good 12 volt output. Look for any motherboard LED's. If you hear beeps, the computer at least started POSTing and the PSU, motherboard, and CPU are probably good. No beeps means that at least one of the three are bad. At that point, all you can do is test the parts by substitution. I say "probably good" here because an inadequate PSU could pass this test and fail later when it's more heavily loaded.

If you heard beeps, that should indicate that the POST detected memory or video problems (no surprise, there's no memory or video card installed). Install the video card and plug in the monitor. Turn on the computer. No beeps now means that the video card is shorting out the PSU. Otherwise, at this point you should see something on the monitor if the video card is good.

Beeps now should indicate memory problems. Install the memory. No beeps probably means that you have a shorted memory chip. Dual channel motherboards can operate with only a single memory module installed. Install each one separately and test. Sometimes motherboards do not properly set the memory operating voltage. That is a more complex problem than the simple "It won't start" problem. ("Simple" is not the same as "easy".)

Now, you should see a "missing keyboard" error. Turn off the PSU and plug in a keyboard.

Turn on computer. Try to enter the BIOS to set date and time and verify the amount of memory present. If you can do this, it means that all the expensive parts are probably good.

Start plugging in the rest of the components and test. No beep, and you have found the problem.

If everything works, it probably means that something was improperly installed in the case. Reassemble in the case and test. If you are lucky, everything works.

I always breadboard a new build. I pretty much reserve the fourth port of my KVM switch for system testing.
September 20, 2007 6:10:09 PM

first I must say thanks for all the effort in helping me. The current status now is after I reseated the CPU and the memory for some reason I get post. A single beep, the splash screen, then it freezes and the splash screen scrambles.

Any guesses now?
a c 172 à CPUs
September 20, 2007 9:25:14 PM

A single beep is good. That means the POST ran successfully. Your hardware list at the beginning specifies an nVidia card. It sounds like you have a video driver conflict. Boot into safe mode and remove the ATI driver, then install the nVidia driver.

If that doesn't work, you may have to wipe the hard drive and do a fresh installation of the OS.
September 21, 2007 11:51:02 AM

It's just one thing after another with this build. Now I've got post, can get into bios. Reads my proc and does the memory test but I can't get bios to recognize my damn drives. I have a 40 gb (winXP OS) and a 160GB (storage) IDE drives and they don't show up. I've tried regular ide cables, and even ide to SATA adapter cable and no luck either way. I got it to recognize my dvd rom when I connected it with the IDE cable, I tried running an ubunto live CD on it just to get it up and the first time it errored out during the boot process saying something like "couldn't find kernal clock time" try running 'no acip'.

The saga continues. Sometimes when I reboot to look at post, the post screen is choppy and the processor name does not show above the memory. Is that CPU related or mobo?

!